Charalampidis, Efstathious G.; John F. Dawson; Fred Cooper; Avinash Khare and Avadh Saxena
We present trapped solitary wave solutions of a coupled nonlinear Schrödinger (NLS) system in 1 +1 dimensions in the presence of an external, supersymmetric and complex PT -symmetric potential. The Schrödinger system this work focuses on possesses exact solutions whose existence, stability, and spatiotemporal dynamics are investigated by means of analytical and numerical methods. Two different variational approximations are considered where the stability and dynamics of the solitary waves are explored in terms of eight and twelve time-dependent collective coordinates (CCs). We find regions of stability for specific potential choices as well as analytic expressions for the small oscillation frequencies in the CC approximation. Our findings are further supported by performing systematic numerical simulations of the NLS system.